Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B60—VEHICLES IN GENERAL
  • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
  • B60C13/00—Tyre sidewalls; Protecting, decorating, marking, or the like, thereof
  • B60C13/002—Protection against exterior elements
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B60—VEHICLES IN GENERAL
  • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
  • B60C1/00—Tyres characterised by the chemical composition or the physical arrangement or mixture of the composition
  • B60C1/0025—Compositions of the sidewalls
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B60—VEHICLES IN GENERAL
  • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
  • B60C13/00—Tyre sidewalls; Protecting, decorating, marking, or the like, thereof
  • B60C13/001—Decorating, marking or the like
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10S152/00—Resilient tires and wheels
  • Y10S152/12—White sidewalls
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T152/00—Resilient tires and wheels
  • Y10T152/10—Tires, resilient
  • Y10T152/10495—Pneumatic tire or inner tube

Definitions

• This invention relates to a coating composition for forming a protective film of a colored rubber portion of a tire and a protective film produced thereby, and more specifically to a coating composition for forming a protective film of a colored rubber portion having a different color(almost white) from a base color(black) of a sidewall portion of a tire and a protective film formed thereby.
• the inventor has made various investigations for attaining the above mentioned objects and as a result, it has been found out that a film made of specific resins which are soluble by water or lower alcohol is colorless and transparent and has satisfactory tenacity required for a protective film and is easy to handle since water and lower alcohol can be used as a solvent.
• the present invention provides, as claimed in claim 1 , a coating composition for forming a protective film of a colored rubber portion of a tire comprising at least one resin with polymerization degree 200 and above selected from the group consisting of polyvinyl acetate resin, vinyl acetate-acrylic acid copolymer resin, vinyl acetate-methacrylic acid copolymer resin, vinyl acetate-alkane acid copolymer resin, vinyl acetate-itaconic acid copolymer resin, vinyl acetate-crotontc acid copolymer resin, vinyl acetate-fumaric acid copolymer resin, vinyl acetate-maleic acid copolymer resin, vinyl acetate-maleic anhydride copolymer resin and polyvinyl alcohol, and at least one solvent for dissolving resins selected from the group consisting of lower alcohols and water, wherein a solution obtained having 30 cps-1,000 cps viscosity.
• Any lower alcohol which is liquid at a room temperature is applicable to the present, invention.
• Methanol, ethanol, propyl alcohol, isopropyl alcohol, butyl alcohol, isobutyl alcohol are preferable, and particularly methanol and ethanol are more preferable.
• Water and lower alcohols are applicable separately or in a mixed form of water and at least one of lower alcohols or in a mixed form of at least two lower alcohols.
• Preferable solvents nay be selected in consideration of solubility of resins and a solution viscosity.
• lower alcohol with lower boiling temperature separately. e.g., methanol or ethanol.
• Solvent having a higher boiling temperature such as water may be mixed with lower alcohols having a lower boiling temperature.
• Polyvinyl acetate resin, vinyl acetate-acrylic acid copolymer resin, vinyl acetate-methacrylic acid copolymer resin, vinyl acetate-alkane acid copolymer resin, vinyl acetate-itaconic acid copolymer resin, vinyl acetate-crotonic acid copolymer resin, vinyl acetate-fumaric acid copolymer resin, vinyl acetate-maleic acid copolymer resin, vinyl acetate-maleic anhydride copolymer resin, and polyvinyl alcohol can be applied separately or in a mixed form of at least two thereof.
• the polymerization degree shall be not less than 200.
• the viscosity of solution including one or two resins dissolved in the solvent shall be 30 cps-1,000 cps by measurement at 25° C. using a SB type viscometer in accordance with a rotational viscometer method described in the Japanese Industrial Standard—JIS K 5400 (hereinafter same measuring method is applied to measure solution viscosity).
• a protective film obtained can not fully perform such functions as preventing contamination and damages.
• the solution viscosity is more than 1,000 cps, uniform coating of the protective film is difficult.
• Preferable solution viscosity is 200 cps-600 cps.
• a coating composition obtained has the following characteristics: 1) each resin component is easily dissolved into the above mentioned solvent or mixed solvent and a coating composition is easily manufactured; 2) coating operation onto a colored rubber portion is easily conducted by means of spray coating or brushing; 3) water or lower alcohol is used as solvent, so that easy and fast drying is performed after coating and rubber components of a tire are not damaged by a coating composition and besides no environmental pollution occurs; and 4) a protective film formed with such composition is colorless and transparent and has preferable tenacity.
• the present invention also provides, as claimed in claim 2 , a protective film formed on the colored rubber portion of a tire using the above coating composition claimed in claim 1 .
• a protective film thus obtained is colorless and transparent and has superior tenacity, so that the function of a protective film such as preventing contamination and damages can be fully performed while maintaining a colored rubber portion with its beauty.
• the protective film according to the present invention requires no troublesome operations such as wrapping a tire and removing a wrap, applying and peeling a plastic film or removing a thin film of colored water-soluble paint as described in connection with the prior arts. Furthermore, there yields no wastes to be disposed.
• the thickness of a protective film is preferably 15 ⁇ m-100 ⁇ m, as claimed in claim 3 .
• the thickness is less than 15 ⁇ m, the effect of preventing contamination and damages is inferior.
• the thickness is more than 100 ⁇ m, there tends to occur cracks on a protective film.
• Thickness of a protective film is preferably 20 ⁇ m-70 ⁇ m.
• One of preferable coating compositions for forming a protective film of a colored rubber portion of a tire was obtained by dissolving polyvinyl acetate resin or any one of aforementioned vinyl acetate copolymer resins having a polymerization degree 200-5000 into a mixed solvent comprising methanol, ethanol and water with the solution viscosity of 200 cps-600 cps.
• the coating composition obtained was coated by means of spray coating on a white circle line on a side wall portion of a tire By natural drying, a colorless and transparent protective film of high tenacity was obtained with the thickness of 20 ⁇ m-70 ⁇ m.
• Another preferable coating compositions for forming a protective film of a colored rubber portion of a tire was obtained by dissolving polyvinyl alcohol having a polymerization degree 200-5000 into water with the solution viscosity of 200 cps-600 cps.
• the coating composition obtained was coated by means of brushing on a white circle line on a tire side wall portion. By natural drying, a colorless and transparent protective film of high tenacity was obtained with the thickness of 20 ⁇ m-70 ⁇ m.
• the protective film obtained was colorless and transparent and of high tenacity, so that contamination or damages of a white circle line on a sidewall portion caused by contact with adjoining tires when transporting or storing was fully prevented, while keeping the white circle line with its beauty.
• Coating composition for forming a protective film of a colored rubber portion of a tire was prepared by dissolving vinyl acetate-crotonic acid copolymer resin of polymerization degree 300 into a mixed solvent comprising methanol, ethanol and water with a component ratio as shown in Table 1.
• Evaluation of the coating composition was made in connection with solution viscosity, uniform coating performances, drying performances and evaluation of the protective film was made in connection with thickness, contamination preventing performances, anti-peeling and cracking performances. The results are shown in Table 1.
• a coating composition and a protective film were prepared in the same manner as described in Example 1 with the exception that polyvinyl alcohol of polymerization degree 300 was used as resin and water was used as solvent with a component ratio as shown in Table 1.
• the results of evaluation of the coating composition and the protective film are as shown in Table 1.
• a composition and a protective film were prepared in the same manner as described in Example 1 with the exception that 25 wt % of vinyl acetate-crotonic acid copolymer resin of polymerization degree 300 and 15 wt % of ethanol were used as shown In Table 1. The results of evaluation are shown in Table 1.
• Used as Comparative Example 1 was a white-line tire having the same tire size of P195/75R14 92S with Example 1 and no protective film on the colored rubber portion, i.e. white line portion.
• a coating composition for forming a protective film of a colored rubber portion of a tire was prepared in the same manner as described in Example 1 with the exception that vinyl acetate-crotonic acid copolymer resins of polymerization degree 300 were used as resin and mixed solvent comprising methanol, ethanol and water was used as solvent with a component ratio as shown in Table 1.
• said coating composition was coated using a pressurized spray gun on a colored portion, i.e. white circle line of a white line tire of P195/75 R14 92S having a white circle line of about 17 mm width arranged on the sidewall portion. Coating and natural drying were repeated several times(so called multi-coating) and a protective film with the thickness of 40 ⁇ m was obtained. The results of evaluation are shown in Table 1.
• a coating composition for forming a protective film of a colored rubber portion of a tire was prepared in the same manner as described in Example 1 with the exception that vinyl acetate-crotonic acid copolymer resins of polymerization degree 300 were used as resin and mixed solvent comprising methanol, ethanol and water was used as solvent with a component ratio as shown in Table 1. The results of evaluation are shown in Table 1.
• the coating compositions and protective films were evaluated by the following evaluating methods.
• Coating condition after applying was evaluated by visual inspection as to the coating compositions in Examples 1-3 and Comparative Examples 2-5.
• a tire coated with the coating composition was dried at 60° C. using an oven and evaluated by drying speed.
• the thickness of the protective film was observed with the magnification 50 using a film thickness measuring apparatus(a zoom stereo microscope manufactured by Nikon Corporation).
• Tires in Examples 1-3 and Comparative Examples 1-5 were loaded into a container in an ordinary manner, and shipped to the United States. In USA site, the contamination of the colored rubber portion(white line portion) was observed by visual inspection.
• Tires in Examples 1-3 and Comparative Examples 2-5 were loaded into a container in an ordinary manner, and shipped to the United States. In USA site, cracking and peeling of the protective film was observed by visual inspection.
• the coating compositions of Examples 1-3 are superior in uniform coating performance and drying performance and coating operation performance.
• the protective films obtained are superior in contamination prevention performance and have superior tenacity. Namely, as shown in Table 1, even when tires coated with the protective films were loaded into a container and shipped to the United States, there occurred no contamination on the white line portion of tires and no crackings and peeling of the protective films.
• Comparative Example 2 the solution viscosity of the coating composition is remarkably low. In order to make the film thickness larger. multi-coating was conducted. However, there occurred cracking and peeling, resulting in the contamination of the white line portion. In Comparative Example 3, the solution viscosity of the coating composition is preferable, but the film thickness is not fully satisfactory, so that there found contamination on the white line portion.
• the coating composition for forming a protective film of a colored rubber portion of a tire has the following merits.
• Each resin components are easily soluble by water or lower alcohols, so that the coating composition is easily prepared.
• the protective film using the above coating composition is colorless and transparent and has superior tenacity, so that the function of a protective film such as preventing contamination and damages can be fully performed while maintaining a colored rubber portion with its beauty.
• the protective film according to the present invention requires no troublesome operations such as wrapping a tire and removing a wrap, applying and peeling a plastic film or removing a thin film of colored water-soluble paint as described in connection with the prior arts. Furthermore, there yields no wastes to be disposed.

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• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Paints Or Removers (AREA)
• Tires In General (AREA)

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Family Applications (1)

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Citations (4)

• 1999
  • 1999-02-15 JP JP11036224A patent/JP2000230145A/ja active Pending
• 2000
  • 2000-02-14 US US09/503,084 patent/US6427740B1/en not_active Expired - Fee Related

Patent Citations (5)

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